In marine carburized gears, it is especially important to determine the optimum carburizing conditions for tooth bending fatigue strength. So it has been conducted the inplane or rotating fatigue tests using the test pieces and determined the optimum conditions experimentally. This report presents the results of pulsating bending fatigue tests of carburized gears under the optimum conditions obtained by test pieces, in order to know whether the optimum of test piece could be applied to gear. The gears used for the test are of 20 deg pressure angle with 34 teeth and 8 module. The results are as follows: In case of gears, the fatigue strength is the highest at 1.1 mm of effective case depth h. This results is almost similar to that obtained by test pieces. The fatigue strength of gears almost correponds to that of test pieces, arranging them by not only the value of h but also the ratio of h to the thickness of gear tooth or test piece. It seems to be still difficult to determine the optimum effective case depth by the value or the ratio. Estimating fatigue limits by hardness and residual stress distributions, the experimental values are about 60 to 70 % of estimated values in case of both gears and test pieces. The difference seems to be caused by the fact that the relation between fatigue limits and hardness used in the estimation is the results obtained by rotating bending fatigue tests.
Study on the fatigue strength of marine gears - bending fatigue strength of carburized gears
Untersuchung der Dauerfestigkeit von Schiffsgetrieben - Dauerbiegefestigkeit aufgekohlter Getriebe
Titel japanisch
Journal of the Kansai Society of Naval Architects ; 56 , 182 ; 73-81
1981
9 Seiten, 19 Bilder, 6 Tabellen, 7 Quellen
Aufsatz (Zeitschrift)
Japanisch
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